EXPERIMENTAL INVESTIGATION TENSILE PROPERTIES OF ROD METAL AA5182 UNDER WIDE RANGE OF STRAIN RATES

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1 International Journal of Civil Engineering and Technology (IJCIET) Volume 9, Issue 11, November 218, pp , Article ID: IJCIET_9_11_228 Available online at ISSN Print: and ISSN Online: IAEME Publication Scopus Indexed EXPERIMENTAL INVESTIGATION TENSILE PROPERTIES OF ROD METAL AA5182 UNDER WIDE RANGE OF STRAIN RATES Asaad Khudhair Hamzah, Haitham M. Ibrahim Al-Zuhairi, Areej Sami Mahdi and Hussain J.M. Al-Alkawi University of Technology/ Iraq. ABSTRACT Tensile properties of rod metal of AA5182 aluminum alloy are affected by the speed of pull or strain rate. The effect of speed of pull (.5, 1.5, 2.5 and 3.5 mm./min) corresponding to strain rates (.833,.249,.333 and.583)s -1 was investigated using uniaxial tensile tests. The analysis of the experimental results revealed that the ultimate tensile strength (US), n, E and G were not significantly affected by increasing the speed of pull or strain rates. While the yield stress (YS) and hardening coefficient (k) were significantly affected and the maximum value of (YS) occurred at 1.5 mm/min (.2495S -1 ). The increase percentage in (YS) was recorded to be 37% compared to the lowest value of (YS). The ductility was found to reduce at 1.5 mm/min (.2495 S -1 ). The highest reduction value wasobtained to be 1.1% showing 18.8% reduction in ductility. Keywords: Mechanical properties; strain rate; of AA5182 Aluminum alloy. Cite this Article: Asaad Khudhair Hamzah, Haitham M. Ibrahim Al-Zuhairi, Areej Sami Mahdi and Hussain J.M. Al-Alkawi, Experimental Investigation Tensile Properties of Rod Metal Aa5182 Under Wide Range of Strain Rates, International Journal of Civil Engineering and Technology, 9(11), 218, pp INTRODUCTION AND LITERATURE REVIEW: Aluminum alloys are important materials because of their good properties such as light weight, strength, recyclability, resistance to corrosion, ease of handling and formability. Therefore, it is used in various applications necessary in our lives, such as the manufacture of the body of (aircrafts, cars and trains) and also in the thermal and electrical industries. The alloys from the 5 class whose primary alloying element is Mg. These alloys are currently is the main element in which the rate of (4.9-4.). In the current research,al. alloy 5182 was used and four speeds were adopted in the tensile device to obtain the effect of the rate of emotion on the editor@iaeme.com

2 Asaad Khudhair Hamzah, Haitham M. Ibrahim Al-Zuhairi, Areej Sami Mahdi and Hussain J.M. Al-Alkawi mechanical properties of this alloy and to determine the best use of speed when conducting the tensile test. Ali H. Ateewy, et.al, studied the approach that involves the theoretical and the experimental effect of strain rate on the hardening exponent. The material used a steel C4 which was received a plate thickness is 1.5 mm and was bent to take the form (U) in various bending rate.for the researcher obtained the following conditions as the yield stress is directly proportional to strain rate and the strain hardening exponent is increased with increase the strain rate.[1] R.C. Picua, et.al, Studied thesensitivity parameters for the strain rate which are determined as a function of temperature and the plastic strain,temperature range and the strain rate in which dynamic strain aging leads to passive strain rate sensitivity is certain. Dynamic strain aging effect of on ductility and strain hardening is investigated.[2] OnurÇavusoglu et.al, studied the strain rate influence on the mechanical properties of AA2139-T351 Al-alloy sheet materials, by conducting uniaxial tensile tests for four various strain rates (.3,.3,.3,.3) s 1. In analyzing the obtained conclusion, it was seen that the anisotropy value, elongation and the load-carrying capacity were reduced. [4] M. TaamjeedRahmaan et.al, investigated the rate sensitivity of DP6, TRIP78, and AA5182-O sheet alloys that are viewed as elected for automotive constitutional applications to reduce body weight. The uniaxial tensile experiment is the standard method used to describe the strain-rate dependent mechanical properties of sheet metals.[5] Xingrong Chu, et.al, studied the formability of sheet metal AA586 is investigated at researched at various strain rates (.2,.2 and 2 s 1 ) and various temperatures (2, 15 and 2 C) via a Marciniak test setup. The experimentel results showed that the formability of AA586 had increased with temperature and lowering with forming speed. [6] A determination of the tensile mechanical properties of 5182 Al alloy has a great importance for automotive and aerospace industry. The present work deals with the determination of mechanical properties of 5182 Al. alloy rod material at the different speed of pull or strain rates. In addition work hardening parameters were also examined. 2. EXPERIMENTAL WORK The material used in this work is AA 5182 in the form of rolled bar of diameter 1 mm. the chemical composition in weight percentage is given in table (1). Table 1 Chemical composition of aluminum alloy 5182 AL element Wt% Element Wt% Zn - Zinc.242 Cr - Chromium.613 Mg - Magnesium 4.18 Sb - Antimoine.15 Si - Silicon.146 Sn - Tin.133 Cu - Copper.339 CA - Calcium.2 Fe - Iron.266 P - Phosphorus.1 Ti - Titanium.244 Others.476 Mn - Manganese.435 Remaining Al Aluminum Tested by Central Organization for Standardization and Quality Control The mechanical properties (Ultimate tensile strength US, yield stress (YS) modulus of elasticity (E) and elongation of AA5182 Aluminum alloy rod material depending on the speed of the pull or the strain rate were obtained at room temperature (RT) editor@iaeme.com

3 Experimental Investigation Tensile Properties of Rod Metal Aa5182 Under Wide Range of Strain Rates Four speeds of pull or strain rate were adopted in this work, namely 1, 1.5, 2.5 and 3.5 mm/min. Twelve samples of the tensile test were examined, three for each speed and the average values were determined by repeating the tests three times for each parameter in order to reduce the margin of error. According to the standard (ASTM A37 / ASME SA-37), the test at four strain rates (.8333,.24999,.3333,.58331) S -1 were carried out on standard specimens shown in fig.(1). While the test rig is computer controlled electronic universal test machine shown in fig. (2). Figure 1 Tensile specimen according to the standard (ASTM A37 / ASME SA-37).All dimensions in mm. Figure 2 computer controlled electronic universal testing Machine model WDW-1, Max. Capacity 1 KN editor@iaeme.com

4 Asaad Khudhair Hamzah, Haitham M. Ibrahim Al-Zuhairi, Areej Sami Mahdi and Hussain J.M. Al-Alkawi The mean values of the four mechanical properties mentioned above were obtained by repeating the experiment three times. The working hardening parameters are also determined depending on the strain rate. 3. RESULTS AND DISCUSSION: The tensile test results of rod specimens were obtained by performing the tests at the (.8333,.24999,.3333,.58331) S -1 strain rates. The results determined from the tensile tests are tabulated in table (2). Table 2 Mechanical properties of aluminum alloy AA5182 AL Speed σy σu E G SR Mm/min (Mpa) (Mpa) (Gpa) Gpa) µ Є% k n Avarege results of four specimens for each strain rate are mentioned above. The data of mechanical properties obtained from the tensile tests and tabulated in table (2) are plotted in fig (3) Stress (MPa) mm/min.(.833) 1.5 mm/min.(.249) 2. mm/min(.3333) 3.5mm/min(.58331) strain% Figure 3 Stress Strain curves for four speed The variation of (US) and (YS) with the strain rate is shown in fig. (4), to vary small extent. Therefore, the (Us) of the investigated alloy is not affected by the increase in the strain rate. This finding is consistent with what was found by Hadianfarb et al [8]. In this work, a small increase amount was found to occur in the tensile strength. The yield stress strain rate relationship fig. (5) Is seen to be affected by the strain rate. The value of (YS) was determined to be (18, 148, 125, 13) MPa and the better strain rate is given high (YS) is.2499 S -1 and the improvement percentage was calculated to be 37% compared to the lowest value of (YS). The ultimate strength (σu) and yield stress (σy) against a strain rate of AA5182 is illustrated in fig (4) editor@iaeme.com

5 Experimental Investigation Tensile Properties of Rod Metal Aa5182 Under Wide Range of Strain Rates (σu) and (σy) against strain rate σu (Mpa) σy (Mpa) strain rate (S -1 ) Figure 4 (σu) and (σy) against strain rate The modulus of elasticity and rigidity were seen to be affected by strain rate in a very small range. The trend of variation is seen to be an approximately linear trend. The amount of modulus of elasticity and rigidity of a material is an important factor for selecting the materials in engineering industries applications. The strain rate versus modulus of elasticity and rigidity can be seen in fig (5) 8 6 modulus of elastisity and rigidity G. E Strain rate (S -1 )) Figure 5 modulus of elasticity and rigidity against strain rate. The relation between work hardening coefficient (K) and work hardening exponent (n) can be shown in fig. (6) editor@iaeme.com

6 Asaad Khudhair Hamzah, Haitham M. Ibrahim Al-Zuhairi, Areej Sami Mahdi and Hussain J.M. Al-Alkawi hardening.24 exponent.235 (n).23 The relation between harding coefficient (K) and hardening exponent (n) (n) K harding coefficient (K) Strain rate (S -1 )) Figure 6 (K) and (n) variation with strain rate The work hardening coefficient (K) was seen to increase up to (.24995) -1 strain rate and then reduce with slight reduction and the maximum value of (K) was recorded at strain rate (.24995) -1 to be 65 Mpa and the minimum value was obtained to be 43 Mpa at strain rate (.58315) -1.For the purpose of finding the percentage reduction or increase the lowest strain rate of (.83335) -1 was selected to be as the reference value. The work hardening exponent (n) was seen to increase up to (.2495)-1 and then reduced as long as the strain rate increased. The value of (n) was found to change in small range when the strain rate increased. The same finding was obtained by Noradilaet al [7].The variation of elongation is known to decrease with an increase of speed of pull or strain rate. Fig (7) illustrates the elongation variation versus strain rate. The maximum elongation happened at the speed of pull of (.5) mm/min (.8333S -1 ) shown 12% ductility. While the minimum elongation was occurred at speed of pull (1.5) mm/min (.24999) -1 showing 1.1% ductility. The reduction in elongation was recorded to be 18.8% compared to the maximum elongation. This outcome is found to be in good agreement what concluded by ozturk et al [9]. 14 Ductility against strain rate Elongation % strain rate (S) -1 Ductility against strain rate Figure 7 Ductility against strain rate editor@iaeme.com

7 Experimental Investigation Tensile Properties of Rod Metal Aa5182 Under Wide Range of Strain Rates 4. CONCLUSIONS Based on the experimental results of tensile tests the main remarks can be drawn as follows. 1. The ultimate tensile strength (US) and work hardening exponent (n) of AA5182 slightly affected by the strain rate. 2. The yield stress (YS) and work hardening coefficient (k) of AA5182 were significant affected by the strain rate. The (YS) varies from 18 to 148 Mpa for.5 mm/min (.8333S -1 ) and 1.5 mm/min (.249S -1 ) strain rate respectively and showing 37% maximum increasing in yield stress. All the yield stress obtained for the other strain rates are high than the.5 mm/min (.8333S 1 ) strain rate. 3. The material shows an approximately linear trend for variation of modulus of elasticity and rigidity via strain rate. 4. The value of ductility was found to decrease with an increase of strain rate and maximum reduction percentage was recorded to be 1.1 % for the 1.5 mm/min pull speed (.249S -1 ) strain rate. REFERENCES: [1] Ali H. Ateewy, Hussain J.M. Al-Alkawi, Ali R. Yusife, Effect of Strain Rate on The Hardening Exponent for Sheet Plate Type C4, Engineering and Technology Journal Volume 23 No 1 Year 24. [2] R.C. Picua, G. Vinczeb, F. Ozturka, J.J. Graciob, F. Barlatb,A.M. Maniattya, Strain rate sensitivity of the commercial aluminum alloy AA5182-O, Materials Science and Engineering A 39 (25) [3] TetsuroOhwue, Ken Takata, Makoto Saga and Masao Kikuchi, Temperature and Strain Rate Dependence of Mechanical Properties and Square Shell Deep Drawability of Al Mg Alloy Sheetsin Warm Working Condition, Materials Transactions, Vol. 43, No. 12 (22) pp to [4] OnurÇavusoglu, Alan Gordon Leacock, HakanGürün, Ahmet Güral,Strain-rate-dependent tensile characteristics ofaa2139-t351 aluminum alloy, materiali in tehnologije/materials and technologyissn Professional article, 51(2)333(217). [5] M. TaamjeedRahmaan, Low to High Strain Rate Characterizationof DP6, TRIP78, AA5182-O, thesis requirement for the degree of Master of Applied Science,Waterloo, Ontario, Canada, (215). [6] Xingrong Chu, Lionel Leotoing, Dominique Guines, Eric Ragneau, Temperature and strain rate influence on AA586Forming Limit Curves: experimental results anddiscussion on the validity of the M-K model,international Journal of Mechanical Sciences, on 25 Feb 214. [7] Noradila A.L., Sajuri Z., Syarif J., Miyashita Y., Motala Y. ((Effect of strain rates on tensile and work hardening properties for Al-Zn magnesium alloys )) Material science and engineering 46 (213). [8] Hadinfard M.J., Smerd R., Worswic K.M.,((Effect of strain rate on mechanical properties and failure Engineering A, 492, (28). [9] Zturk F., Toros S., Kilic S.,(( Evaluation of tensile properties of 552 type aluminummagnesium alloy at warm temperature )), Archives of materials science and engineering 34,2,95-98(28) editor@iaeme.com